RES System 3, LLC

RES System 3, LLC is a specialty electrical contractor based in Carmichael, California. With roots dating back to its founding as System 3 Inc., the company has established itself as an experienced provider of general engineering, procurement, construction (EPC), and consulting services for the renewable energy sector—particularly in utility-scale solar and wind projects. Their expertise spans constructing complex solar installations such as hillside arrays in challenging environments like the Virgin Islands ($9.5 million project) and advanced desert solar projects ($1.5 million). RES System 3 also undertakes hydroelectric work and provides comprehensive electrical contracting for substations and transmission lines.
In November 2015, Renewable Energy Systems Ltd. (RES) acquired substantially all assets of System 3 Inc., integrating it into its broader operations to form RES System 3, LLC. This acquisition enabled expanded capabilities in renewable energy infrastructure across North America while maintaining continuity of leadership under Joel Leineke.
The company’s client base includes utilities as well as select federal/commercial clients seeking turnkey solutions from initial design through commissioning—covering all scopes from module placement to full system wiring. As of recent data, RES System 3 reports annual revenues around $20 million with a small but specialized team operating out of Carmichael.